* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  height: 100%;

  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
}

.nav {
  height: 50px;

  background-color: rgb(50, 50, 50);
  color: white;

  line-height: 50px;
  padding-left: 20px;
}

.container {
  width: 100%;
  height: calc(100% - 50px);

  display: flex;
  align-items: center;
  justify-content: center;
}

#opponent-name {
  font-size: 18px;
  font-weight: bold;
  margin-bottom: 10px;
}